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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c40eef8d8cec5793b24d3dab51d69992fbe44babbb5cc702110da53e5bb1a3f' 
  AND token = 'Ro15pAMkweRPa7yAdwnqzogVJdHXGkdb0vdnoE/6PXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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