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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0568f27f6d568f53e642962da99701b1a8a8f16043a4a5b90daf211a74214f32' 
  AND token = 'iLto9spPcQaXLv3lpiwpjsnxGUiqrmgauS3cpmSBCNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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