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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51e7933a5aa2b83b7990d2fc2e9494b4f330353f79c7c4cbb203ba3b7e265de' 
  AND token = '8EaX7WqyVuh9ZTJLfh5jUwFgllr7j7dPwc+zTbK+8R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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