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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb7446ffce7800a99e308f8b45bcf0b37202ebd72f60cd6e86689d81759bd7c' 
  AND token = 'LX5X3bI1XzZJk3O4NWnKks7IBd+f+eo/FZFJqdINoXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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