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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebd5ab664e0f5deb3f78c32e35384a8425c7d6215e01c141809ba5782125396' 
  AND token = 'Ug7+aqQ/ukiDdUAJKs2Wq1Lu4ofCf+2t0X1qQP8xnVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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