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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e886c67903c40ec1c8cfdc1b4c4b716d5a05f3fc8d86c6d2af565f1e5c7a99' 
  AND token = '0CLyYGyRG0gB16nPk/2W4B1ULAQHEc22l7NkRzWZg/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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