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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1d8df3c4aab053f4e983ecd16cb9f7f7c9f27d05ed19ae0d9d714fc930fb67' 
  AND token = 'mjk5MS8bRCx/ppksRgH2QPNVJzDyCatH/xJcc+EbJYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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