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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1150ae635ae9aa6c2b15ed0ab058a89d2522104aa086278a293ae17be66e0cf5' 
  AND token = 'aqyeSk+TkkKmAng7PL2E1BVDMhTn7kK2ioxGbh/b3SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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