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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b3aef0778c2a6c165880e4f98107235b91199d2827313abed4537b0e7900b0f' 
  AND token = 'eOGqLexh9lc2tukZc1UlxNijr3W/VMpQ1jMCgnAWAZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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