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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdbff0b60af8dcf6c706ef194fc5310e8a160a0048e96a753fa5c804ad298e2' 
  AND token = 'pcjjbuStuE5D1HkMVuvPMmg1r2tLOWiax4sn6hRyLus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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