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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938a21a4c3401e5914cb2fc728e578675bc575c0de86baaa2c5c202d2aaffad5' 
  AND token = 'gRs2c6MzxYAjYIgpN9ITc/hbCCJquYwUR46NtmAsCus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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