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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feac9b17534398bc9d19e0ea7451731434d7d68974629b0d9c36bc0d1a68aaa2' 
  AND token = 'R/qzu5Au+cmR2uTapaWZsVJRvr1ygrq8pG9Onj9VT7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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