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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd926eb3989ef65472d989540b55b926144ff4cd3e1f4c6a9c64ce14d4f7fe8b' 
  AND token = 'kb2gVyR5oJBZZDZ2z1k8soSNe8xdJrtqPNGv4XUUd3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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