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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b82a2d5c6b7035e1d0e1ec34dc3f527a979f7db3b7c5ff4f8502a6a89cea61f' 
  AND token = 'e0+dGN/N4s7wKxGYdgHJqdI8yV2YodkKHA5aPtUWnMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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