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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59182bf252714c6f5bf513740230120e86812ad6c23bfa2c816eaf616d784d07' 
  AND token = 'D73fjFBaX4Ga9TAvOblQ0PvjG74erd6n3NFsUwH938M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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