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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09af59d675248618ab1ffde814e890e1dad6544838d84847e0c4d050a15198c8' 
  AND token = 'Cvi1Jy+HJvcqsBX7+i2xQ8L6CdKne3l3IzOEBJWz/ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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