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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9756d2ce34cad318ae9d37ebfb6cc30abf0a9f6b987927a6ea87c91b011d50' 
  AND token = 'nK4rebfGK+/Vw0cJLPAK40iBuNvURtVcHshcVkIoGaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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