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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad988950316b9fd03dff7b298caa879e13e9a5f1bbe18b7a07e318dc7a196fbe' 
  AND token = '7HQFNxKezMY13Ovx+PgnWmJTTEOeNnVGyM51D0t6ejw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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