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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb8518040d83817d4115bff1c93ffbc4607b1251ccb8e54155b2fa9f6fdf03a' 
  AND token = 'K3IQmvYh1/2RA6YshXmH5p4CykxWq3GF9lls1OODyuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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