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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bced3ae8d0d34c50c1d5496cfdb260df5fe5397db20493b52c5064ceb29035f3' 
  AND token = 'QW0yvmL2avEUn1MbVMGOxb9dgUQvt7/6LDtnt0a9rkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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