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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f059e5d1f1ca90435063db97fe0ae3ad6a8a59967624ea263c0c518b861dd78d' 
  AND token = 'EuoBxJ3Zr23fk+29fhVM463DRCAejPRwf82s2vyHJ4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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