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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a718a601605bb4ff0ecea2db3cd837f26f55a66f4675a5e5155cf4b851c44ba6' 
  AND token = 'fcdsjKvVJ306UTu352y1lKuPTZId7MhDackqjDtHxFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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