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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6987a8ccf408a8af517e8f3029325e2cb8585702f45c50e8bd3b89c3c0afa1' 
  AND token = 't+xKzUsgwOL5Z47ZvskbXGv8ahVyDhn5Gy0H3Mi3SoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}