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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85832bc654df1de1c52896d993c3b060f5443685aa33aa644afc4e963c4a6cb0' 
  AND token = 'OfngMwqgvb5UPvqvlZyYvjWNl6SEAZKu/OxG0uY5p2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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