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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61eaf288e92221534a129dc389c7d2f670924505774eb8826a941b6d3772358d' 
  AND token = 'Jb3d8mcRVBHpnsx/cySp4ccAUvZUOc1NdZ11q1aIoB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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