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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c932edb05c91b469250ce4148a0b22965a53c474a58e28b4407c9658dc9cd693' 
  AND token = '3RreI5ZKFZ8wtWTvm24hcsEiBr44KT17oOiM9dLv5/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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