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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e4ded3f000273b958ecd1fe78301f27384aea190ec84398d2736572f67530ef' 
  AND token = 'Du/2a6Et2cV74ftT0mo/L/v8Ep7c/uS3qPizTi6+W/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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