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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bd0d959cfab317b7bf39ffbb9c69b0c51e6c6e7256a2c1aad01f18fc3746ef' 
  AND token = 'hvHQiEpilWELkDjNQtf+hlM52QSaquWOLZr0XB8kJU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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