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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8d8a34ecb959be0dfbf2c0558bd3b7d26024dcb898820bdd28e2b2956defb76' 
  AND token = 'XHIAi6DAupY5JHP5dtc106Z22wxDGgAKH0n8r3Qh9aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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