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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d0c5c41bf2cd5fe29ef311f587a7ffb1bc0aa030f58bd3bff7c4f77d2c77a8' 
  AND token = '9XBD3EM4LoezAhvPoRII3CKXViqHlQi68RpmPArtNCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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