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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f5d033463a9e2fd4b14f77875b21d136b0ce317b09e98ff294ff1110c7d11f' 
  AND token = 'KljqTfz+sNtQyy6s5zZ5LYByK6ary+zD/rDMDy9umUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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