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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ba697a16dbb437b998849ef9295ef30e8e784725cde0a81480dc14e1550394' 
  AND token = '4MwWQiT/5D4CD1vLS7NP+vqcrIv8jSheloLiuunXoqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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