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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0e626fb02613e37c82cf78c61b3dd4583f80436dd657951d87afd1d2b19e63' 
  AND token = 'OVnSIew/YnqZa6OOlwlVblRIGN2OYYOD4x3uBchsrXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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