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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ab158d7e7d8141b8ddd7ef3945fb6d1435a973f4df6f633dea4caef9cd0fc8' 
  AND token = 'TpzOPZeaaVW1JR04w8Jge4Yrwg93jHg1coKe4VeES90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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