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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb2442a2d9df2a50dc0a91f9d8dc27288adfdef644777aec73eb2e109e10fb5' 
  AND token = 'A9byIdxhjtE6970HCnqDC8GnIOIIwYuVJE5fstIIMug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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