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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c71101b430050bce191263d07c64c32f99eb2830d48938d28f2f3c114b3a8f1' 
  AND token = 'SZi/xFwgJ+qo9/Jvc+XXQn00Dz1Wo3ACtx2N01vj0S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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