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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0914949204a6d8825ee3b298a3c91c30c30110af4423e567db07a3bf67a6836a' 
  AND token = 'eG182MeZ1VZvbc9lV7P5AfcV76FeqzgAfdJZ+/1IS14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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