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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be1bda6d82d3f8e89fa3f8e4cdfd9f78df77e66f61640551d9a9a5b17552a9b' 
  AND token = '0Ihn40Y3aEFO8XJ0HTKOp1T0ve9YgKC9PXc2IVkrPUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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