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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908030640052f246beb415b874824c79c31d59daace0d679ac8d85f6d46da22a' 
  AND token = 'td2AVkK/G7ff1kK+w3O+SPcUUqMniLoLvv6iIEAU1vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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