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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ca36249a2f316320612fe216653f8b7d3929284410a440cd10b103e11c9765' 
  AND token = '/J7c+w2Ph7StsFkaWwtqdubq+C5hdwr4wFPg4SWTtT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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