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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920a0b4f6cce053f05fcdcbd891359dfb6453eb61c332ae15c554a8b455065e6' 
  AND token = 'Edl1shCTSAG4aIT66WpnH0WkodvqlW/zYee6179ofsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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