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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8eed88b51b15af99bbe46ddb7b97e0d0c856dcb53f9cc0df2b2843f8a51b4b6' 
  AND token = 'WSix9NKkCX30TXdkoVdD+i538hyF1Ikp7hHCwO0aVM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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