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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e4a9de78bc8397aa89b8048234728c25cac646250032db963c10f5a7abfc75a' 
  AND token = '9KcTuF/0A+QL355mpebYdm6P27YCzh6X85u8ehnKbXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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