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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f5d4c02f43c0b52d7694f6b4239220015a542e4c49da7d8dbd4d0f3b975316' 
  AND token = 'KGcMJ9vhvcSu6dk4Zdb/gv3p8/zUdkUlINEgXFeQ/Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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