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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582931c08390400413711756bf21d78f66251baa2a75114ab2e96235261552e7' 
  AND token = 'LVRMkRYww2OMzQ5vYBL1eAeLE9XAINdfCjOX+5gMP6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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