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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b582e56f311848f0a3d5e7aac749abe0c20053dbc744af7939d721a2250913c' 
  AND token = 'nQAduvv+4HAMdVHJnXbJy7OqxZdsoXT+C2b1sFGDolc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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