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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b40b6be8b2d2d42385ecbf262556d1fe96518f76956989923abd69439ae13f' 
  AND token = 'PoCeUoDtj49FI4KbJP+M8ipsbaY5Yb/ioRypG7yxejg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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