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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bddeecc9690208ab8fdd419432268058a35a02b35e27b092e2fb6f834431fcb' 
  AND token = 'UJLtJXbT7G6nNaZ1l4FNlrdGQn26jKcL1afj4Zpm/90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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