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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5ee3de3d03bb4a619443400e8e10de18d08ffeaabe7fbaac6422701a8ebef4' 
  AND token = '/a4/rLiqoZiiuLBBri4pzoWrLJ5ls5iqVF32MtCoBnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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