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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca25c31f5157b7775ba5dfdd0bbeb1db9ec73723ee3bd3acf69c41fa30eae2eb' 
  AND token = 'pk4nz/EFPV3PEE9BQbK/O5V1kgOLRhupuMrKL3IxQKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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