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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8a778a22cbd621dfdca4c9e7b9e3d5378156b39af3e31ba98d88a54cc1b019' 
  AND token = 'nIuAlR8Z9GnKOl+IINb5/KSMajBbZIx+OZG/Dr9gQ3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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