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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c595c6a7caa9ae2f624b46dee3ae587f99e3d929bcf50bfc9a78a35eaf7391' 
  AND token = 'ntCChiqCwr8KSCK78BDzdKNcOM2LORGpa88m9HorOkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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