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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827c82126c66ed51b43799260afa86cffae7f2536ef96c6fd090191acbebfa00' 
  AND token = 'fJxcNRI0he3LwwRqgHK5fYf44DlVNX13XL+dSiP4naI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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