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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3bf1ed026b1e8d7d2894d2304736d20dc1a32939d7b21d933dca5b7db6c0850' 
  AND token = '5BMqEM1Fvxb5TU4HvI9eBl/34ZtejMxAj1caeC6RQ7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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