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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7d8eb05699423fab9fbdfd4a5de2f305fc5938c475ba9c51ff5dcced1d9e12' 
  AND token = '7ETyTcJduXCabNpNv5nM488EFH1YUpQzcyYSf2Ymk+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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