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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fa967ea9b9c77d76034c81a002b9f0a1859aa37156358fafd5c373152cd03b' 
  AND token = 'ozdTUu5rSqhLBS+wuud4p//vtUBBLBmxY9HLSyIrN1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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