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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a901476be069713180c89be87dd780ae0605cc36e822003cf35ecea51aa5cf77' 
  AND token = 'd1JpB90wthwrnJ0bDpswx4ejRzlVW3mdGz6siFPds+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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