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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2f9662b19884e15208aa5763258f7eeaea50e5aaa3ae4a87b4ea745e8fda3c' 
  AND token = 'rtToVf5tPWKyUGcAFJ4m1+XUdHqkWEP/pL2vc5vPF8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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