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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a0b7f9588c0828d7fc7f1d3bf77c74517af914b6cb25cab6ed844333739be6' 
  AND token = '4foopP3fmTQcL2y1OB7mnnMhYViT8RwmoJAuvDp4pDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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