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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1909e9dad9f2cb49907461846b909ab3fd6c0ddc4c6f66b6fc3782e45ede412' 
  AND token = 'TB2dAt/5qGzrBT14ffebLUmm39p2/I2UObY3EbEXE8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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