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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99dda0cb4820e91c55bf0da0f4f85e263d6f2591ba742c5a30739b27e04d5a16' 
  AND token = 'SSj11W8b3JNykxQp+/L80xoSGfNbxhOPZkuIR4qzO+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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