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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a960ea440d5b8c77043aaa9eb172f6750193f1ceef5df6200d99f4c52f5167' 
  AND token = 'PNcGgdpv7qtYCDv3F9ehfOLt7nbpMd87S8SDAqlO4Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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